使用MotionEvent.ACTION_MOVE制作类似主屏幕的ViewFlipper

Question

好吧我有一个ViewFlipper，其中嵌套了三个LinearLayouts。它默认显示第一个。此代码：

// Assumptions in my Activity class: 
// oldTouchValue is a float 
// vf is my view flipper 
@Override 
public boolean onTouchEvent(MotionEvent touchEvent) { 
    switch (touchEvent.getAction()) { 
    case MotionEvent.ACTION_DOWN: { 
     oldTouchValue = touchEvent.getX(); 
     break; 
    } 
    case MotionEvent.ACTION_UP: { 
     float currentX = touchEvent.getX(); 
     if (oldTouchValue < currentX) { 
     vf.setInAnimation(AnimationHelper.inFromLeftAnimation()); 
     vf.setOutAnimation(AnimationHelper.outToRightAnimation()); 
     vf.showNext(); 
     } 
     if (oldTouchValue > currentX) { 
     vf.setInAnimation(AnimationHelper.inFromRightAnimation()); 
     vf.setOutAnimation(AnimationHelper.outToLeftAnimation()); 
     vf.showPrevious(); 
     } 
     break; 
    } 
    case MotionEvent.ACTION_MOVE: { 
     // TODO: Some code to make the ViewFlipper 
     // act like the home screen. 
     break; 
    } 
    } 
    return false; 
} 

public static class AnimationHelper { 
    public static Animation inFromRightAnimation() { 
    Animation inFromRight = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, +1.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f); 
    inFromRight.setDuration(350); 
    inFromRight.setInterpolator(new AccelerateInterpolator()); 
    return inFromRight; 
    } 

    public static Animation outToLeftAnimation() { 
    Animation outtoLeft = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, -1.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f); 
    outtoLeft.setDuration(350); 
    outtoLeft.setInterpolator(new AccelerateInterpolator()); 
    return outtoLeft; 
    } 

    // for the next movement 
    public static Animation inFromLeftAnimation() { 
    Animation inFromLeft = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, -1.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f); 
    inFromLeft.setDuration(350); 
    inFromLeft.setInterpolator(new AccelerateInterpolator()); 
    return inFromLeft; 
    } 

    public static Animation outToRightAnimation() { 
    Animation outtoRight = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, +1.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f, 
    Animation.RELATIVE_TO_PARENT, 0.0f); 
    outtoRight.setDuration(350); 
    outtoRight.setInterpolator(new AccelerateInterpolator()); 
    return outtoRight; 
    } 
} 

...处理视图翻转但动画非常“开/关”。我想知道是否有人能帮我解决最后一部分问题。假设我可以访问LinearLayouts，有没有一种方法可以根据deltaX和deltaY设置布局的位置？

有人给我this link，并说我应该参考applyTransformation方法提示如何做到这一点，但我不知道如何重复这种相同的行为。

Answer 1

移动视图，当你移动你的手指是很容易做到：

case MotionEvent.ACTION_MOVE: 
    final View currentView = vf.getCurrentView(); 
    currentView.layout((int)(touchEvent.getX() - oldTouchValue), 
      currentView.getTop(), currentView.getRight(), 
      currentView.getBottom()); 
break; 

现在，这只是移动当前视图，而不是邻居。我还没有测试，但那些可能可以通过getChildAt获得：

vf.getChildAt(vf.getDisplayedChild() - 1); // previous 
vf.getChildAt(vf.getDisplayedChild() + 1); // next 

希望有所帮助。

Answer 2

如果我明白你的要求，这种影响现在应该使用View Pager

看起来是这样实现的：